/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification of Java bytecode.
 *
 * Copyright (c) 2002-2018 GuardSquare NV
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard.classfile.editor;

import proguard.classfile.*;
import proguard.classfile.attribute.*;
import proguard.classfile.attribute.visitor.ParameterInfoVisitor;

/**
 * This ParameterInfoVisitor adds all parameter information that it visits to the given target method parameters
 * attribute.
 */
public class ParameterInfoAdder implements ParameterInfoVisitor {
    private final ConstantAdder constantAdder;
    private final MethodParametersAttribute targetMethodParametersAttribute;

    /**
     * Creates a new ParameterInfoAdder that will copy parameter information into the given target method parameters
     * attribute.
     */
    public ParameterInfoAdder(ProgramClass targetClass, MethodParametersAttribute targetMethodParametersAttribute) {
        this.constantAdder = new ConstantAdder(targetClass);
        this.targetMethodParametersAttribute = targetMethodParametersAttribute;
    }

    // Implementations for ParameterInfoVisitor.

    public void visitParameterInfo(Clazz clazz, Method method, int parameterIndex, ParameterInfo parameterInfo) {
        // Create a new parameter.
        int newNameIndex =
            parameterInfo.u2nameIndex == 0 ? 0 : constantAdder.addConstant(clazz, parameterInfo.u2nameIndex);

        ParameterInfo newParameterInfo = new ParameterInfo(newNameIndex, parameterInfo.u2accessFlags);

        // Add it to the target.
        targetMethodParametersAttribute.parameters[parameterIndex] = newParameterInfo;
    }
}